MCQ on Engineering materials Steel classification
| If carbon present in cast iron is partly free and partly in combined state, it is called ............. (a) White cast iron (b) Grey cast iron (c) Molten cast iron (d) None of these |
| Ans : (a) |
| Increasing carbon content in steel,............ ultimate strength and............. ductility of steel. (a) increases, decreases (b) decreases, decreases (c) increases, increases (d) decreases, increases |
| Ans. (a) |
| The open hearth process of steel making is sometimes called : (a) Siemens-Martin process (b) Thomas process (c) White hearth process (d) Aston or Byers process |
| Ans : (a) |
| Tool steel contains..............of carbon. |
(a) 0.6% (b) 0.03%
(c) 0.05% (d) 0.9%
| Ans : (d) |
| Austenitic stainless steel contains............ (a) 8% chromium and 18% nickel (b) 18% chromium and 18% nickel (c) 18% chromium and 8% nickel (d) 8% chromium and 8% nickel |
| Ans : (c) |
| Composition of HSS 18 : 4 : 1 is? |
| (a) 18% W, 4% Cr, 1% V (b) 18% Cr, 4% W, 1% V |
(d) 18% Cr, 4% Ni, 1% W
(a) 0% (b) 0 to 1%
(c) 1% to 2% (d) 2% to 4%
Ans. (a)
18/8 stainless steel refers to stainless steel grade
with composition
(a) 18% Chromium and 8% Nickel
(b) 18% Nickel and 8% Chromium
(c) 18% Vanadium and 8% Chromium
(d) 18% Chromium and 8% Vanadium
Ans. (a)
As percentage of carbon increase in steel
its.............. decreases
(a) Corrosion resistance
(b) ultimate strength
(c) Hardness
(d) Ductility
| Ans : (d) |
High speed steel tool material contains carbon
| (a) 0.6%–1.0% (c) 0.6%–4.3% | (b) 2.0%–4.3% (d) 6%–10% |
Ans. (a)
Cast iron is characterised by minimum of
following % age of carbon
| (a) 0.2% (c) 4.3% | (b) 2% (d) 2.2% |
Ans. (b)
The ingredient of high speed steel of T series
are:
(a) Vanadium, chromium and tungsten
(b) Vanadium, chromium and cobalt
(c) Vanadium, cobalt and Nickel
(d) Chromium, Nickel and steel
Ans. (a)
| Chromium in steel: (a) Improves wear resistance, cutting ability and toughness (b) Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties (c) Improves cutting ability and reduces hardenability (d) Gives ductility, toughness, tensile strength and anticorrosion properties |
| Ans. (d) |
| Percentage of carbon in high carbon steel is: (a) 0.15 to 0.25% (b) 0.25 to 0.5% (c) 0.6 to 1.4% (d) Greater than 1.8%/1.8% |
| Ans : (c) |
| Percentage of carbon in Cast Iron is. |
(c) 1% to 2% (d) 2% to 4%
| Ans. (d) |
| Match the following related to type of steel and its product: A. Mild steel 1. Hammers B. Tool steel 2. Crane hooks C. Medium carbon steel 3. Milling cutters D. High carbon steel 4. Commercial beams |
(a) 3 4 1 2
(b) 4 1 2 3
(c) 3 2 4 1
(d) 4 3 1 2
| Ans. (d |
| Alloy steel containing 23 to 30% chromium with carbon less than 0.35% is known as............. (a) Shock-resistance steel (b) heat-resistance steel (c) magnet steel |
Which material is most commonly used for
manufacturing of machine tool bed?
(a) Mild steel
(b) Gray cast iron
(c) white cast iron
(d) Galvanized iron
manufacturing of machine tool bed?
(a) Mild steel
(b) Gray cast iron
(c) white cast iron
(d) Galvanized iron
Ans. (b
The corrosion resistance property of stainless
steel is due to the presence of
(a) manganese (b) chromium
Ans : (b
The carbon present in Cast irons may occur in
the chemically combined form known as........
(a) Ferrite (b) Pearlite
(c) Cementite (d) Steadite
Ans : (c
___ is present in high percentage in magnet
steel.
(a) Aluminium
(b) Tungsten
(c) Zinc
(d) Copper
Ans : (b)
In the structure of steel, globular form of
cementite is obtained through:
(a) Normalising
(b) Carbonizing
(c) Spheroidising
(d) Malleabilising
Ans : (c
Which of the following is close to the purest
form of Iron?
(a) Cast Iron
(b) Wrought Iron
(c) Grey Iron
(d) Mild Steel
Ans : (b)
The unique property of cast iron is its high
(a) Malleability
(b) Ductility
(c) Hardness
(d) Damping characteristics
Ans : (d)
Pure iron is a substance of :
The corrosion resistance property of stainless
steel is due to the presence of
(a) manganese (b) chromium
| (c) cobalt | (d) silicon |
Ans : (b
The carbon present in Cast irons may occur in
the chemically combined form known as........
(a) Ferrite (b) Pearlite
(c) Cementite (d) Steadite
Ans : (c
___ is present in high percentage in magnet
steel.
(a) Aluminium
(b) Tungsten
(c) Zinc
(d) Copper
Ans : (b)
| Which of the following is NOT a type of cast iron? (a) Malleable (b) Grey (c) Ductile (d) Plain carbon |
| Ans : (d) |
| Alloys with carbon content higher than 2.1% are known as: (a) high speed steel (b) hypoeutectoid steel (c) hypereutectoid steel (d) cast iron |
| Ans : (d |
| Which of the following material is brittle: (a) Mildsteel (b) Aluminum (c) Copper (d) Cast iron |
| Ans : (d |
| German silver is an alloy of (a) Silver and Tin (b) Silver and Gold (c) Nickel and Copper (d) Nickel, Copper and Zinc |
| Ans : (d) |
In the structure of steel, globular form of
cementite is obtained through:
(a) Normalising
(b) Carbonizing
(c) Spheroidising
(d) Malleabilising
Ans : (c
Which of the following is close to the purest
form of Iron?
(a) Cast Iron
(b) Wrought Iron
(c) Grey Iron
(d) Mild Steel
Ans : (b)
The unique property of cast iron is its high
(a) Malleability
(b) Ductility
(c) Hardness
(d) Damping characteristics
Ans : (d)
Pure iron is a substance of :
(a) Ferrite
(b) Pearlite
(c) Austenite
(d) Ferrite and Cementite
Ans : (a)
Pure iron at room temperature has following
micro structure :
(a) γ-iron (b) δ-iron
(c) Cementite (d) α-iron
(b) Pearlite
(c) Austenite
(d) Ferrite and Cementite
Ans : (a)
Pure iron at room temperature has following
micro structure :
(a) γ-iron (b) δ-iron
(c) Cementite (d) α-iron
Ans : (d
Steel having combination of 6.67% carbon and
93.33% iron is known as
(a) Cementite
(b) Pearlite
(c) Martensitic
(d) Austenitic
Ans : (a
When steel containing more than 0.8% carbon
is cooled slowly below the lower critical point,
it contains
(a) Ferrite mainly
(b) Pearlite mainly
Steel having combination of 6.67% carbon and
93.33% iron is known as
(a) Cementite
(b) Pearlite
(c) Martensitic
(d) Austenitic
Ans : (a
When steel containing more than 0.8% carbon
is cooled slowly below the lower critical point,
it contains
(a) Ferrite mainly
(b) Pearlite mainly
| (c) Ferrite & pearlite (d) Pearlite & cementite |
| Ans : (d) |
| In 18-4-1 HSS, what is the percentage of chromium? |
(b) 4%
(c) 18%
(d) None of the above
| Ans : (b |
| Cast iron contains carbon : |
(c) < 2% (d) > 2%
| Ans : (d) |
| Presence of cobalt in steel improves its: (a) Cutting ability (b) Corrosion resistance (c) Tensile strength (d) None |
| Ans. (a) |
| Molybdenum high speed contains : (a) 6% vanadium, 2% chromium and 4% tungsten (b) 2% vanadium, 4% chromium and 6% tungsten (c) 4% vanadium, 6% chromium and 2% tungsten (d) 2% vanadium, 6% chromium and 4% tungsten |
| Ans : (b) |
(a) tensile strength
(b) hardness
(c) ductility
(d) Conductivity
Ans : (a)
(a) Cementite (b) Pearlite
(c) Flakes (d)Spheroids
(a) Hardness (b) Brittleness
(c) Porousness (d) Softness
Which form of the iron is having existence
between 9100C and 14030C
Ans : (b)
Hardness of steel depends upon amount of........
Ans : (c)
Steel with carbon below 0.8% is called _____.
0.8%
(a) Eutectoid steel
(b) Hypo-eutectoid steel
(c) Austenite
(d) Hyper-eutectoid steel
Ans : (b)
| Vanadium when added to steel? (a) Increases tensile sterength (b) Decreases tensile sterength |
| (c) Raises critical temperature (d) None of the above |
| Ans. (a) |
| High speed steel should have A. wear resistance B. hardness C. toughnes |
| (a) only A (b) only B (c) only C (d) Both A and B |
| Ans : (d) |
| Steel containing 11% to 14% chromium and 0.35% carbon is called ____. (a) Martensitic stainless steel (b) Ferritic stainless steel (c) Austenitic stainless steel (d) None of these |
| Ans : (a) |
| Steel containing 18% chromium and 8% nickel is called _____. (a) Martensitic stainless steel (b) Ferritic stainless steel (c) Austenitic stainless steel (d) None of these |
| Ans : (c) |
| In grey cast iron, carbon is present in the form of: |
(c) Flakes (d)Spheroids
| Ans : (c) |
| Silicon is added in low carbon steels to increase –— Property |
(c) Porousness (d) Softness
| Ans : (a) |
| Grey cast irons are often used at the base of heavy machines because of its high : (a) Stiffness (b) strength (c) Toughness (d) Damping capacity |
| Ans : (d) |
| Cupola is best suited for melting (a) Aluminium alloys (b) Alloys of Copper (c) Ferrous metals (d) Non-ferrous metals |
| Ans : (c) The percentage of carbon in low carbon steel is (a) 0.15% (b) 0.30% (c) 0.50% (d) 0.70% |
| Ans : (b) |
Which form of the iron is having existence
between 9100C and 14030C
| (a) α-iron (c) β-iron | (b) γ-iron (d) δ-iron |
Hardness of steel depends upon amount of........
| (a) Pearlite (c) Cementite/ | (b) Ferrite (d) Martensite |
Steel with carbon below 0.8% is called _____.
0.8%
(a) Eutectoid steel
(b) Hypo-eutectoid steel
(c) Austenite
(d) Hyper-eutectoid steel
Ans : (b)